NAME    [Toc]    [Back]

     vm_page_protect -- lower a page's protection

SYNOPSIS    [Toc]    [Back]

     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/vm_page.h>

     void
     vm_page_protect(vm_page_t mem, int prot);

DESCRIPTION    [Toc]    [Back]

     The vm_page_protect() function lowers a page's protection.  The protection
 is never raised by this function; therefore, if the page is already
     at VM_PROT_NONE, the function does nothing.

     Its arguments are:

     mem   The page whose protection is lowered.

     prot  The protection the page should be reduced to.  If VM_PROT_NONE is
	   specified, then the PG_WRITABLE and PG_MAPPED flags are cleared and
	   the pmap_page's protection is set to VM_PROT_NONE.  If VM_PROT_READ
	   is specified, then the PG_WRITABLE flag is cleared and the
	   pmap_page's protection is set to VM_PROT_READ.

     Higher protection requests are ignored.

AUTHORS    [Toc]    [Back]

     This man page was written by Chad David <davidc@acns.ab.ca>.


FreeBSD 5.2.1			 July 14, 2001			 FreeBSD 5.2.1